Infra refers to Infrathin, a concept coined by Marcel Duchamp. When asked for a conceptual definition of the term "infrathin," Duchamp replied that the notion is impossible to define, "one can only give examples of it:" I think of it as intangible, yet undeniably present, beyond our full comprehension. Both eternal and ephemeral. Undefinable, ungraspable. Present. InfraThin.
